4 Series/Parallel
Operation
5 Input Voltage/
Current Range
4.1 Series Operation
¡
You can use the power supplies in series operation by wiring as
shown below. In the case of (a) below, the output current should
be lower than the rated current of a power supply with the lowest
rated current among power supplies that are serially connected.
Please make sure that no current exceeding the rated current
flows into a power supply.
(a)
(b)
4.2 Redundancy Operation
¡
You can use the power supplies in redundancy operation by wiring
as shown below.
¡
Even a slight difference in output voltage can affect the balance
between the values of I
1
and I
2
.
Please make sure that the value of I
3
does not exceed the rated
current of a power supply.
¡
If you use a non-regulated power source for input, please check
and make sure that its voltage fluctuation range and ripple voltage
do not exceed the input voltage range shown in specifications.
¡
Please select an input power source with enough capacity, taking
into consideration of the start-up current (Ip), which flows when a
DC-DC converter starts up.
6 Assembling and Installation
6.1 Installation
¡
You can install the units in any direction. Place them in such a
way that there is enough ventilation so that heat does not get ac-
cumulated around them.
¡
Do not place a pattern layout in the hatched area shown in Fig.
6.1. Doing so may cause insulation failure on the PCB surface on
which the power supply is mounted. If you need to place a pattern
layout other than a land pattern in the hatched area, please con-
tact us.
On-board type
Instruction Manual
G-40
SU.SUC
On-board type
Instruction Manual
G-41
SU.SUC
D1 - D4 : Use a schottky barrier diode
with low forward voltage.
D1, D2 : Use a schottky barrier diode
with low forward voltage.
Fig.4.1 Series Operation
Fig.4.2 Redundancy Operation
I
3
[
Rated Current Value
Ip
In
pu
t C
ur
re
nt [A
]
Input Voltage [V]
Input Voltage Range
Fig.5.1 Input Current Characteristics
A
A
+Vout
-Vout
+Vin
-Vin
Outer Contour
of the Unit
Fig.6.1 Area where Pattern Layout should not be Placed
A: SU Series
2mm
SUC Series 2.5mm
D2
D1
+
-
-
+
Power
Supply
Power
Supply
12V or more
Lo
ad
Power
Supply
Power
Supply
D4
D2
+
-
-
+
5V or less
D1
D3
Lo
ad
Power
Supply
Power
Supply
+
-
-
+
Lo
ad
Lo
ad
Power
Supply
Power
Supply
I
2
I
1
I
3
-
+
+
-
Lo
ad
